Study selection and assessment:

randomised controlled trials (RCTs) that included participants facing real life decisions about whether to be screened (an
investigation done by a health professional); compared PRC with GRC; and assessed cognitive, affective, behavioural, health
status, or economic outcomes. Exclusion criteria: studies of mass communication or military, school, or prison interventions.
Quality of individual studies was assessed using the Jadad scale and a second method score.